Recipe Preparation

Prepare barbecue (medium heat). Whisk sour cream and chipotle chiles in small bowl; season with salt. Whisk brown sugar and next 5 ingredients in another small bowl to blend for spice rub.

Place zucchini and bell pepper on rimmed baking sheet. Drizzle with canola oil; toss to coat. Sprinkle spice rub over both sides of vegetables and chicken.

Place chicken and vegetables on barbecue. Grill until vegetables are tender and browned in spots and chicken is cooked through, turning occasionally, about 5 minutes. Transfer to work surface; cut chicken crosswise into 1/2-inch-thick strips. Cut vegetables crosswise into 3/4-inch pieces. Place chicken and vegetables in large bowl; toss to blend.

Place chicken and vegetables, chipotle cream, tortillas, slaw, and lime wedges on table. Allow guests to assemble their own soft tacos.